Steel Y30 CDSR
Supply condition
GB Y30
CDSR = cold drawn, stress relieved
Pick when slender turned or milled parts must stay straight after asymmetric metal removal.
Values for the CDSR condition
Other Y30 tempers and conditions
Y30 is listed in 8 conditions; see the grade overview at Y30.
Compare all 8 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution annealed | Softest condition; choose when maximum dimensional stability or cold forming after machining is needed. | 280 | 500 | 23 | 160 HB | — |
Hot rolled | Lowest-cost stock for larger diameters that will be fully machined or heat treated later. | 320 | 545 | 17 | 170 HB | — |
Normalized | Uniform fine pearlitic structure for consistent machining response and better toughness than as-rolled heavy sections. | 340 | 570 | 19 | 180 HB | — |
CDSRThis page Cold drawn, stress relieved | Pick when slender turned or milled parts must stay straight after asymmetric metal removal. | 490 | 620 | 13 | 190 HB | — |
CDDefault Cold drawn | Standard stocked condition: tight tolerance, bright surface and higher yield strength for automatic-lathe production parts. | 540 | 640 | 10 | 197 HB | — |
Induction hardened | Used on finished Y30 shafts/journals needing a hard wear surface over a tough core. | 560 | 700 | 10 | 54 HRC | 8.8 % IACS |
quenched and tempered, medium strength | Choose for moderately loaded machined shafts and fittings that still need reasonable toughness. | 700 | 860 | 15 | 26 HRC | — |
quenched and tempered, high strength | Highest practical through-hardened strength for Y30; use where wear and load beat the need for impact toughness. | 830 | 1,000 | 12 | 32 HRC | — |
What is Y30 CDSR?
Y30 CDSR is Y30 supplied in the CDSR condition — pick when slender turned or milled parts must stay straight after asymmetric metal removal. Y30 CDSR has a yield strength of 490 MPa (71.1 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 61% of steel grades. Elongation at break is 13% and the elastic modulus is 205 GPa (29.7 Msi). Y30 CDSR has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,420°C (2,588 °F). CD is the default condition FabDigit quotes; CDSR is available on request or by drawing note.
Advantages
- Easy to machine — 73/100, better than 97% of steel grades
- Low embodied carbon — 1.9 kg CO₂/kg, better than 92% of steel grades
- High electrical conductivity — 9.6 % IACS, better than 78% of steel grades
Limitations
- Low fracture toughness — 50 MPa·√m (45.5 ksi·√in), worse than 86% of steel grades
- Limited ductility — 13%, worse than 78% of steel grades
- Difficult to weld — 25/100, worse than 77% of steel grades
Y30 CDSR properties
Typical room-temperature values for Y30 CDSR; 10 are specific to this condition. Other listed values are Y30 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
Y30 CDSR has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,420°C (2,588 °F).
Mechanical16
Y30 CDSR has a yield strength of 490 MPa (71.1 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 61% of steel grades. Elongation at break is 13% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
Y30 CDSR is rated for continuous service to 400°C (752 °F). It conducts heat at 47 W/m·K (27.2 BTU/hr·ft·°F), better than 75% of steel grades. Thermal expansion is 11.7 µm/m·K (6.5 µin/in·°F).
Electrical3
Y30 CDSR conducts electricity at 9.6 % IACS, better than 78% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (11/100), worse than 73% of steel grades.
Sustainability4
Producing a kilogram of Y30 CDSR takes about 25 MJ of energy and emits 1.9 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 30%.
Manufacturability7
Y30 CDSR's machinability is very good (73/100, better than 97% of steel grades); weldability poor (25/100); formability poor (25/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Y30 CDSR
Is Y30 easy to machine?
Excellent for high-speed automatic turning — MnS inclusions give short chips and clean threads; run generous speeds with sharp carbide and coolant, and expect ~75 % of AISI 1212 rate.
Can Y30 be welded?
Not recommended for structural welds; high sulfur plus medium carbon promotes hot cracking and porosity — if unavoidable, preheat 150–250 °C, use low-hydrogen filler and post-weld stress relieve.
Can Y30 be formed, bent or molded?
Limited cold formability and poor transverse ductility; do bending/heading with generous radii or work hot at 1050–1200 °C, avoiding finishing below ~850 °C.
What surface finishes work on Y30?
Takes zinc/nickel plating, black oxide, phosphating and paint well after degreasing; sulfide inclusions can leave micro-pits or streaks on mirror-polished or hard-chromed surfaces.
Y30 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| C | 0.27 – 0.35 | 0.31 |
| Si | 0.15 – 0.35 | 0.25 |
| Mncombines with S to form free-cutting MnS | 0.7 – 1 | 0.85 |
| Sintentional free-machining addition | 0.08 – 0.2 | 0.14 |
| P | ≤ 0.06 | 0.03 |
| Crresidual | ≤ 0.15 | — |
| Niresidual | ≤ 0.25 | — |
| Curesidual | ≤ 0.25 | — |
| Fe | balance | — |
Y30 CDSR — frequently asked
What is Y30 CDSR used for?
Y30 CDSR is typically used for shafts, bolts and studs. In short: stronger than Y12/Y15 grades; heat-treatable to 34 HRC; free-cutting 1132 equivalent.
What is the yield strength of Y30 CDSR?
Y30 CDSR has a typical yield strength of 490 MPa (71.1 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 61% of steel grades. Strength varies by condition: see the 8 listed tempers.
Is Y30 CDSR easy to machine?
Yes — machinability is rated very good (73/100, better than 97% of steel grades). Excellent for high-speed automatic turning — MnS inclusions give short chips and clean threads; run generous speeds with sharp carbide and coolant, and expect ~75 % of AISI 1212 rate.
Can Y30 CDSR be welded?
Not readily — weldability is rated poor (25/100). Not recommended for structural welds; high sulfur plus medium carbon promotes hot cracking and porosity — if unavoidable, preheat 150–250 °C, use low-hydrogen filler and post-weld stress relieve.
What surface finishes work on Y30 CDSR?
Takes zinc/nickel plating, black oxide, phosphating and paint well after degreasing; sulfide inclusions can leave micro-pits or streaks on mirror-polished or hard-chromed surfaces.
Can Y30 CDSR be formed, bent or molded?
Limited cold formability and poor transverse ductility; do bending/heading with generous radii or work hot at 1050–1200 °C, avoiding finishing below ~850 °C.
What is the maximum service temperature of Y30 CDSR?
Y30 CDSR is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Y30-CD and Y30-A?
CD is the default condition — standard stocked condition: tight tolerance, bright surface and higher yield strength for automatic-lathe production parts. A: softest condition; choose when maximum dimensional stability or cold forming after machining is needed. Yield strength is 540 MPa in CD versus 280 MPa in A.
Sources
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.16 — Machining — ASM International (1989)
- SAE J403 / AISI 1132 resulfurized carbon steel composition — SAE International (2014)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.